train and evaluate errors

[fighting41love]

1. We can successfully run the train() and evaluate() seperately.
2. We first train and save each model. Then, evaluate the performance of the model after the training.
   There is an error:

( Mac os 10.11, python 2.7, tensorflow 0.11.0)
`Preparing data in ./data/django/
Creating 2 layers of 512 units.
Reading model parameters from ./train/translate.ckpt-40
Reading development and training data (limit: 0).
Traceback (most recent call last):
File "translate.py", line 443, in
tf.app.run()
File "/anaconda/lib/python2.7/site-packages/tensorflow/python/platform/app.py", line 30, in run
sys.exit(main(sys.argv))
File "translate.py", line 440, in main
train()
File "translate.py", line 290, in train
evaluate()
File "translate.py", line 352, in evaluate
translate_file()
File "translate.py", line 149, in translate_file
model = create_model(sess, False)
File "translate.py", line 225, in create_model
forward_only=forward_only)
File "/Users/yy/PycharmProjects/test_code2comment/seq2seq/seq2seq_model.py", line 89, in init
w = tf.get_variable("proj_w", [size, self.target_vocab_size])
File "/anaconda/lib/python2.7/site-packages/tensorflow/python/ops/variable_scope.py", line 339, in get_variable
collections=collections)
File "/anaconda/lib/python2.7/site-packages/tensorflow/python/ops/variable_scope.py", line 262, in get_variable
collections=collections, caching_device=caching_device)
File "/anaconda/lib/python2.7/site-packages/tensorflow/python/ops/variable_scope.py", line 118, in get_variable
name, "".join(traceback.format_list(tb))))
ValueError: Variable proj_w already exists, disallowed. Did you mean to set reuse=True in VarScope? Originally defined at:

File "/Users/yy/PycharmProjects/test_code2comment/seq2seq/seq2seq_model.py", line 89, in init
w = tf.get_variable("proj_w", [size, self.target_vocab_size])
File "translate.py", line 225, in create_model
forward_only=forward_only)
File "translate.py", line 248, in train
model = create_model(sess, False)`

Anyone know how to solve the problem?
Thanks!